CVE-2015-3939: Directory traversal vulnerability in the NC854 and NC856 modules for IDS RTU 850C devices allows remote authen

This month

MEDIUM 6.8MITIGATEMITIGATE

CVE-2015-3939 is a medium-severity flaw (CVSS 6.8) affecting nc854, nc856. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in the NC854 and NC856 modules for IDS RTU 850C devices allows remote authenticated users to read arbitrary files via unspecified vectors involving an internal web server, as demonstrated by reading a TELNET credentials file.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-22
Published	2015-05-31
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: ids

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-05-31 17:59 UTCPublished CVE record published
2026-06-17 00:26 UTCUpdated Record last modified

ids nc854 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nc854 || rpm -q nc854 || nc854 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

ids nc856 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nc856 || rpm -q nc856 || nc856 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-3939?

nc854: mitigate or apply the listed mitigation; nc856: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-3939 being exploited?

CVE-2015-3939 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-3939 affect?

CVE-2015-3939 affects nc854, nc856. Severity is medium (CVSS 6.8). Directory traversal vulnerability in the NC854 and NC856 modules for IDS RTU 850C devices allows remote authenticated users to read arbitrary files via unspecified vectors involving an internal web server, as demonstrated by reading a TELNE

How urgent is CVE-2015-3939?

Priority 45/100. No elevated risk signals yet.

References

← Back to latest CVEs